Source : Webster's Revised Unabridged Dictionary (1913)

Summit \Sum"mit\, n. [F. sommet, dim. of OF. som, sum, top, from
   L. summum, from summus highest. See {Sum}, n.]
   1. The top; the highest point.

            Fixed on the summit of the highest mount. --Shak.

   2. The highest degree; the utmost elevation; the acme; as,
      the summit of human fame.

   3. (Zo["o]l.) The most elevated part of a bivalve shell, or
      the part in which the hinge is situated.

   {Summit level}, the highest level of a canal, a railroad, or
      the like, in surmounting an ascent.